Check out this video of Heather Morris talking about tonight’s brand new episode of Glee, and get a sneak peek of the boys versus girls mash-up numbers!

The girls of the glee club really let loose in their rock mash-up performance – especially Lea Michele, who provocatively gets down on the floor! Decked out in some sexy black leather ensembles, they totally look like rock stars, and their mash-up involves some serious head-banging and hair-tossing. Meanwhile, the guys keep it a little more cute and classy in blazers and ties, doo-wopping and snapping their fingers.

Check out tonight’s episode to see which group YOU think deserved to win the mash-up contest!

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